Umbrella stand



FIG. 1 is a perspective view of an umbrella stand my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a right view thereof; and,

FIG. 7 is a left side view.

The ornamental design for an umbrella stand, is as shown and described.